We proposed a doped silicon microhole arrays metasurface absorber that works in the long-wave infrared region. The absorbance of the absorber is significantly increased, we found the real part of the doped silicon refractive index decreases, which leads to the decrease of the equivalent refractive index of the structure. Guided mode resonance exists in the structure, which forms Fano resonance after interaction with external radiation. Fano resonance can limit the electromagnetic field in the structure, improve the interaction between light and doped silicon, and realize the purpose of absorption enhancement.Simulated results verify that the absorbance of the absorber with the optimized structure above 37.7% at 9.67 μm.
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